Nitroaminophenylarsinic acid.



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LUDWIG BENDA, OI? FBANKFOBT-ON-THE-MAIN, GERMANY, 'ASSIGNOR TO, Fm

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MANY, A oonroannon or GERMANY.

KIIBQAMINOPHENY LARSINIC. ACID.

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No Drawing.

To all whom it concern:

Be it known that I, LUD'WIG BENDA, Ph. 1)., chemist, a citizen of theRepublic of Swit zerland, residing at Frankfort-on-t-heMain,

-Germeoy, have invented certain new and useful Improvements inNitroaminophenyh arsinic Acid, ofwhich the following is a specification.

I have found that the nitroacidylaminophenylarsinic acids (Asoni, :no,=Nimc=1 2 4,) obtainable, for instance, by the action of or senious acidupon the diszo compound of the acetyl-nitro-p-phenylenediamin I (NH,:NO:NHAc: 1:2-:4,) can be transformed, into the hitherto unlmownnitroaminophenylarsinic acid ofthe to constitutional formula:

f therapeutic purposes.

, The following example illustrates my in- Specification of LettersPatent.

Patented Oct. 14., 1913.

Application filed November 6, 1912. Serial No. 729,754.

vol tion: 6 kilos oi nitroacetylaminophenylarsinic acid are heated onthe reflux apparatus for several hours with 50 liters of sulfuric acidof 10% strength. The whole, mixture first turns into a' solution, andafter some time the nitroaminophenylarsinic acid separates in'the formof brownish long needles. When recrystallized from hot wster,

it forms orange-colored small needles which are scarcely soluble in coldwater and which dissolve only'with ditliculty in diluted mineral acidsand in alcohol, more readily in methyl alcohol and glacial acetic acid,very readily in alkalis and sodium acetate. When heated, thenew compoundassumes a. dark color at 240 C., and melts at about 258 withdecomposition.

Having now described my invention, what s I claim is:

Asa new product, the nitroerninophenylarsinic acid containing the atomgroups As O H N0 NH, in "the 1:2:4posit-ion, crystcllizing in the formof orange-colored needles, dilficultly. soluble in water, alcohol,diluted. mineral acid, readily soluble kalis and sodium acetate,assuming when heated to about 240 C. a. dark color and melting at atemperature of about 258 C. with decomposition.

In testimony whereof, I aflix my signature in presence of two witnesses.

LUDWIG BENDA.

Witnesses 2 J EAN Gnunn, CARL GRUND.

in 111- V

